<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>页面未找到 - 404错误</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            background-size: 400% 400%;
            animation: gradientBG 15s ease infinite;
            color: #fff;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
        }

        @keyframes gradientBG {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        .container {
            max-width: 800px;
            width: 100%;
            padding: 40px;
            background: rgba(0, 0, 0, 0.7);
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(10px);
        }

        .error-code {
            font-size: 10rem;
            font-weight: 900;
            margin-bottom: 20px;
            text-shadow: 4px 4px 0 rgba(0, 0, 0, 0.2);
            color: #ff6b6b;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: #ffd166;
        }

        .message {
            font-size: 1.3rem;
            margin-bottom: 30px;
            line-height: 1.6;
            color: #f7f9f9;
        }

        .home-btn {
            display: inline-block;
            padding: 15px 40px;
            background: #ff6b6b;
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.2rem;
            transition: all 0.3s ease;
            border: 2px solid transparent;
            box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
            margin-top: 20px;
        }

        .home-btn:hover {
            background: transparent;
            border-color: #ff6b6b;
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(255, 107, 107, 0.6);
        }

        .animation-container {
            position: relative;
            height: 150px;
            margin: 30px 0;
        }

        .lost-astronaut {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0% { transform: translate(-50%, -50%); }
            50% { transform: translate(-50%, -60%); }
            100% { transform: translate(-50%, -50%); }
        }

        .lost-astronaut svg {
            width: 100px;
            height: 100px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .error-code {
                font-size: 8rem;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .message {
                font-size: 1.1rem;
            }
            
            .container {
                padding: 30px 20px;
            }
        }

        @media (max-width: 480px) {
            .error-code {
                font-size: 6rem;
            }
            
            h1 {
                font-size: 1.7rem;
            }
            
            .home-btn {
                padding: 12px 30px;
                font-size: 1rem;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="error-code">404</div>
        <h1>哎呀，页面丢失在太空中！</h1>
        
        <div class="animation-container">
            <div class="lost-astronaut">
                <svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
                    <circle cx="100" cy="85" r="30" fill="#fff"/>
                    <circle cx="90" cy="75" r="5" fill="#000"/>
                    <circle cx="110" cy="75" r="5" fill="#000"/>
                    <path d="M85 95 Q100 105 115 95" stroke="#000" stroke-width="3" fill="none"/>
                    <rect x="70" y="115" width="60" height="50" rx="10" fill="#fff"/>
                    <rect x="80" y="125" width="15" height="15" rx="3" fill="#4ecdc4"/>
                    <rect x="105" y="125" width="15" height="15" rx="3" fill="#4ecdc4"/>
                    <rect x="85" y="150" width="30" height="15" rx="5" fill="#4ecdc4"/>
                    <circle cx="60" cy="115" r="10" fill="#fff"/>
                    <circle cx="140" cy="115" r="10" fill="#fff"/>
                </svg>
            </div>
        </div>
        
        <p class="message">
            您试图访问的页面不存在或已被移除。<br>
            可能是URL输入错误，或者页面已被移至新位置。
        </p>
        
        <a href="/" class="home-btn">返回首页</a>
    </div>
</body>
</html>